Easy to fix solution below.
Over the past few days or longer in my Linux Mint KDE 18.2 system which has been working very well, stopped working well for some primary KDE applications. All other applications and the desktop still worked fine. But my main KDE programs like Korganizer, Kontact, Kmail, Kalarm, etc... have not been working and the message is "Akonadi personal information management service not operational".
Apparently some recent updates messed up how the Akonadi system works which the aforementioned KDE applications rely upon. I do not know if it was a MySQL update, Plasma 5 Update, or some other update. I did a lot of research into this over days and found many complaints and many responses with various solutions. I tried many suggestions, but some methods wanted to remove too many of the installed applications.
I was just about to reinstall Linux Mint KDE 18.2 or 18.3 amid thoughts of hara-kiri (joke) when I thought I would take another look, and found what appears to be a simple fix (solution).
Just rename or delete your home folder's configuration folder for Akonadi and reboot (.local/share/akonadi/). Your system will automatically create a new fresh Akonadi configuration folder. This can be done using a file manager like Dolphin or from the konsole terminal prompt. If you have more than one user account, then do this for all user accounts.
To delete the Akonadi configuration folder from the konsole terminal prompt.
Code: Select all
sudo rm -r ~/.local/share/akonadi/
Hope this helps ...